阅读说明：本技术 一种双向塑料土工格栅及其制造方法 (Bidirectional plastic geogrid and manufacturing method thereof ) 是由 何晓婷 罗建群 赵艳红 何迪春 于 2019-12-30 设计创作，主要内容包括：本发明涉及一种双向塑料土工格栅及其制造方法,包括同步压制的多个肋条,多个节点和整幅长的加强筋,所述双向塑料土工格栅相邻的两节点之间、相邻的节点和加强筋之间均通过肋条连接形成双向塑料土工格栅单网,所述的每个双向塑料土工格栅单网内横向至少设置有一条整幅长的加强筋,所述加强筋与所述的双向塑料土工格栅的竖向垂直,所述加强筋的两个侧面至少有一个侧面连接有所述肋条,所述肋条的平面投影图形呈哑铃状,竖向的肋条与加强筋的连接部呈内陷曲面状；相邻的双向塑料土工格栅单网之间在连接处通过加强筋固定连接。本装置使用能增加土工格栅单网之间连接强度。(The invention relates to a bidirectional plastic geogrid and a manufacturing method thereof, wherein the bidirectional plastic geogrid comprises a plurality of ribs, a plurality of nodes and reinforcing ribs with the whole width, the two adjacent nodes of the bidirectional plastic geogrid, the adjacent nodes and the reinforcing ribs are connected through the ribs to form a bidirectional plastic geogrid single net, each bidirectional plastic geogrid single net is internally and transversely provided with at least one reinforcing rib with the whole width, the reinforcing ribs are vertical to the bidirectional plastic geogrid, at least one side surface of each of two side surfaces of each reinforcing rib is connected with the corresponding rib, the plane projection graph of each rib is in a dumbbell shape, and the connecting parts of the vertical ribs and the reinforcing ribs are in an inward-sinking curved surface shape; and the adjacent two-way plastic geogrid single nets are fixedly connected at the joint through a reinforcing rib. The device can increase the connection strength between the geogrid single meshes.)

1. A bidirectional plastic geogrid comprises a plurality of ribs, a plurality of nodes and a whole-width long reinforcing rib which are pressed synchronously, it is characterized in that the two adjacent nodes of the bidirectional plastic geogrid and the nodes and the adjacent reinforcing ribs are connected through ribs to form a bidirectional plastic geogrid single net, the plane projection pattern of the ribs is dumbbell-shaped, at least one reinforcing rib with the whole width is arranged in each bidirectional plastic geogrid single net along the transverse direction of the bidirectional plastic geogrid single net, at least one side surface of the two side surfaces of the reinforcing rib is connected with the rib, the connecting part of the rib and the reinforcing rib in the vertical direction is in an inwards concave curved surface shape, the ribs in the vertical direction are vertical to the transverse direction, the side face, connected with the ribs, of each reinforcing rib is in a bathtub side face shape, and the adjacent two-way plastic geogrid single nets are fixedly connected through the reinforcing ribs at the connection positions.

2. The bi-directional plastic geogrid according to claim 1, wherein: the bidirectional plastic geogrid single net is also at least provided with a whole-width long reinforcing rib along the vertical direction of the bidirectional plastic geogrid single net, and at least one side surface of two side surfaces of the reinforcing rib is connected with the rib.

3. The bi-directional plastic geogrid according to claim 1 or 2, wherein: the ribs, nodes or reinforcing ribs are respectively provided with convex points and/or concave points, and the convex points and/or concave points can form numbers, letters, characters, patterns or patterns and combinations thereof.

4. The bi-directional plastic geogrid according to claim 1 or 2, wherein: still be connected with the inclined rib between strengthening rib and the adjacent node and/or between the double-phase adjacent node, the inclined rib is the acute angle with the contained angle of vertical direction, the both ends of inclined rib with the junction of strengthening rib and/or node is the kitchen knife form, just the junction of inclined rib both ends kitchen knife form is hand like the symmetry.

5. The bi-directional plastic geogrid according to claim 1 or 4, wherein: the ribs and/or the oblique ribs are twisted.

6. The bi-directional plastic geogrid according to claim 1 or 2, wherein: the reinforcing ribs are provided with nodes and/or ribs.

7. The bi-directional plastic geogrid according to claim 1 or 2, wherein: and the reinforcing ribs are provided with through holes and/or blind holes.

8. The bi-directional plastic geogrid according to claim 1 or 2, wherein: the projection pattern of the grid cavity holes of the single geogrid mesh is fillet trilateral, fillet quadrilateral, fillet pentagonal, fillet hexagonal, fillet octagonal, trilateral, quadrilateral, pentagonal, hexagonal, octagonal, curve polygonal, runway-shaped or oval and the combination of the shapes.

9. A method of manufacturing a bi-directional plastic geogrid according to any one of claims 1 to 8, comprising the steps of:

(1) extruding a polymer plate with specified thickness and width by using thermoplastic plastic particles and additives through an extruder, wherein the temperature of the extruder is controlled to be 100-400 ℃;

(2) manufacturing a plastic pore plate with a vertically and/or horizontally widened pore gap, wherein the ratio of the width of the widened pore gap to the width of the pore gap which is not widened is more than or equal to 1.8;

(3) the plastic hole plate with the widened hole gap is subjected to biaxial stretching in the vertical direction and the horizontal direction; the stretching temperature is controlled to be 80-380 ℃; or when the body of the biaxial stretching bidirectional plastic geogrid is in a thermal deformation state through heat absorption, applying external force to the geogrid to realize triaxial stretching, wherein the direction of the external force forms an acute angle with the included angle of a transverse stretching plane;

(4) manufacturing concave and convex points on the upper and lower bottom surfaces of a vertical whole-width long reinforcing rib, arranging a die with certain patterns on a transverse stenter, and simultaneously manufacturing the concave and/or convex points on the upper and/or lower bottom surfaces of the vertical reinforcing rib when the grating is transversely stretched.

10. A method of manufacturing a bi-directional plastic geogrid according to claim 9, wherein: another preferable method for manufacturing the full-width long reinforcing ribs and the concave and convex points on the upper and lower bottom surfaces of the nodes is to manufacture the full-width long reinforcing ribs and the concave and convex points on the upper and lower bottom surfaces of the nodes by using the biaxial-stretched or triaxial-stretched bidirectional plastic geogrid through a specific mold press roll or a laser printer in a thermal deformation state of the bidirectional plastic geogrid.

Technical Field

The invention belongs to the technical field of geotechnical reinforcement materials, and particularly relates to a bidirectional plastic geogrid and a manufacturing method thereof.

Background

The plastic geogrid is a two-dimensional latticed net material which is formed by taking high polymer polymers such as polypropylene, high-density polyethylene and the like as main raw materials and directly stretching the polymers through extrusion or stretching the polymers and then welding the polymers, is generally used for laying in soil, and forms an efficient stress transmitter through the engagement and interlocking action between the grid meshes and the soil body, so that local load can be quickly and effectively transmitted to the soil body with a large area, and the aims of reducing local damage stress and prolonging the service life of engineering are fulfilled.

In the prior art, the product width of the biaxial tension plastic geogrid is less than 6.5 meters, the equipment investment for producing the biaxial tension plastic geogrid with the product width not less than 6.5 meters and the nominal longitudinal and transverse tensile strength greater than 50KN/m is huge, the single piece expansion length of the plastic geogrid is less than 100 meters, and for the biaxial tension plastic geogrid with higher tensile strength, the difficulty is caused to the transportation or construction of the plastic geogrid due to the overlong single piece length of the geogrid; at the job site of laying of geogrid, the overlap joint mode that traditional geogrid widen the increase is: binding ribs of the geogrid together by using plastic belts at the lap joint of 15-20 cm in the longitudinal direction and 10-15 cm in the transverse direction, and fixing the ribs on the ground by using U-shaped nails every 1.5-2.0 m; the unidirectional stretching plastic geogrids are vertically increased by adopting plastic connecting rods in a cross connection mode, the bidirectional stretching plastic geogrids cannot realize the single-net connection between the bidirectional stretching plastic geogrids due to the fact that the size of the meshes of the bidirectional stretching plastic geogrids is too small, and the problem of low strength of the lap joint exists when the labor cost is consumed in the field lap joint assembly mode of the existing bidirectional stretching plastic geogrids.

The problem that the traditional geogrid is generally smooth in surface and relatively small in friction force with the ground and slides with the ground is solved, so that the conventional geogrid has water storage and storage capacity and is beneficial to the growth of plants when the geogrid is used for vegetation; meanwhile, the problem of low connection strength between the single nets in the transverse direction of the biaxial stretching plastic geogrid is solved, and the problem of low connection strength between the single nets in the vertical direction of the biaxial stretching plastic geogrid still exists.

Disclosure of Invention

The invention provides a bidirectional plastic geogrid which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a bidirectional plastic geogrid comprises a plurality of ribs, a plurality of nodes and a whole-width long reinforcing rib which are pressed synchronously, the two adjacent nodes of the bidirectional plastic geogrid and the nodes and the adjacent reinforcing ribs are connected through ribs to form a bidirectional plastic geogrid single net, the plane projection pattern of the ribs is dumbbell-shaped, at least one reinforcing rib with the whole width is arranged in each bidirectional plastic geogrid single net along the transverse direction of the bidirectional plastic geogrid single net, at least one side surface of the two side surfaces of the reinforcing rib is connected with the rib, the connecting part of the rib and the reinforcing rib in the vertical direction is in an inwards concave curved surface shape, the ribs in the vertical direction are vertical to the transverse direction, the side face, connected with the ribs, of each reinforcing rib is in a bathtub side face shape, and the adjacent two-way plastic geogrid single nets are fixedly connected through the reinforcing ribs at the connection positions.

In the application, at least one reinforcing rib with the whole width is transversely arranged on each single bidirectional plastic geogrid net, so that the integral rigidity of the plastic geogrids can be further improved, and the vertical connection efficiency and the connection strength between the single plastic geogrid nets are improved; the side surface of the whole long reinforcing rib between two adjacent vertical ribs in the vertical direction of the geogrid is in a bathtub side surface shape, so that the contact surface between the whole long reinforcing rib and the filler can be improved, and the interlocking force and the friction force between the whole long reinforcing rib and the filler are further improved; the connecting parts of the vertical ribs and the whole long reinforcing ribs are in a sunken curved surface shape, and through the transition of the curved surface shape, the tensile strength of the geogrid can be enhanced, and the reinforcing capacity of the bidirectional plastic geogrid to engineering projects is ensured.

Preferably, the bidirectional plastic geogrid single net is also provided with at least one reinforcing rib with the whole width in the vertical direction, and at least one side surface of two side surfaces of the reinforcing rib is connected with the rib.

The whole width of the reinforcing ribs are vertically arranged on the bidirectional plastic geogrid, so that the overall rigidity of the bidirectional plastic geogrid can be further improved, and the overall reinforcing effect of the bidirectional plastic geogrid is further improved.

Preferably, the ribs, nodes or reinforcing ribs are respectively provided with convex points and/or concave points, and the convex points and/or concave points can form numbers, letters, characters, patterns or patterns and combinations thereof.

The ribs, the nodes or the whole long reinforcing ribs are respectively provided with convex points and/or concave points, so that the contact area with the soil body can be increased, and the friction force is improved; on the other hand, the ribs, the nodes or the whole long reinforcing ribs have certain water storage capacity, so that the growth of plants is facilitated; the convex points and/or concave points can form numbers, letters, characters, patterns or patterns and combinations thereof, so that the product can be further marked, and the product quality can be effectively traced.

Preferably, still be connected with oblique rib between strengthening rib and the adjacent node and/or between the two adjacent nodes, the contained angle of oblique rib and vertical direction is the acute angle, the both ends of oblique rib with the junction of strengthening rib and/or node is the kitchen knife form, just the junction of oblique rib both ends kitchen knife form is hand like the symmetry.

Oblique ribs are connected between the side surface of the whole long reinforcing rib and the node and/or between two adjacent nodes, so that the anisotropy of the stress of the geogrid can be weakened, the stress of the geogrid is approximately uniformly distributed in the circumferential direction of the geogrid, and the bearing capacity of the geogrid is further improved; the joints of the two ends of the oblique ribs and the whole long reinforcing ribs and/or the joints are in a kitchen knife shape, so that the mechanical strength of the joints of the oblique ribs and the joints and/or the reinforcing ribs can be further improved, and the pulling resistance and the friction force between the oblique ribs and the soil body can be improved.

Preferably, the ribs and/or the oblique ribs are twisted.

The ribs and/or the oblique ribs are arranged in a twisted shape, so that the shearing resistance of the ribs and/or the oblique ribs can be improved, and meanwhile, the friction force between the ribs and the soil body can be further increased.

Preferably, the reinforcing ribs are provided with nodes and/or ribs.

The reinforcing ribs are provided with the nodes and/or the ribs, so that the contact area between the reinforcing ribs and the soil body can be increased, and the pulling resistance and the friction force between the reinforcing ribs and the soil body are increased.

Preferably, the reinforcing rib is provided with a through hole and/or a blind hole.

The through holes are formed in the reinforcing ribs, so that friction can be increased, the blind holes are formed in the reinforcing ribs, friction can be improved, and meanwhile, the reinforcing ribs have a certain water storage function and are beneficial to plant growth.

Preferably, the projection pattern of the mesh cavity of the planar single mesh is a rounded triangle, a rounded quadrangle, a rounded pentagon, a rounded hexagon, a rounded octagon, a trilateral, a quadrangle, a pentagon, a hexagon, an octagon, a curved polygon, a racetrack shape or an ellipse, and a combination of the shapes.

According to the actual situation of the reinforced engineering, the bidirectional plastic geogrid with different hole pattern combinations is used for different engineering for reinforcing, and the reinforcement effect of the geogrid can be fully exerted.

Preferably, the fixed connection mode of the bidirectional plastic geogrid single net at the connection position through the reinforcing ribs is U-shaped nail pin connection, welding, inserting connection, riveting, bolt connection, bonding, knitting, sewing, bundling, connection rod penetrating connection or injection molding connection and the combination of the connection modes.

A method for manufacturing a bidirectional plastic geogrid comprises the following steps:

(1) extruding a polymer plate with specified thickness and width by using thermoplastic plastic particles and additives through an extruder, wherein the temperature of the extruder is controlled to be 100-400 ℃;

in the production of manufacturing boards of PP bi-directional plastic geogrids, the processing temperature of an extruder is controlled between 160 ℃ and 240 ℃, and the processing temperature exceeding the range has poor production stability.

(2) Manufacturing a plastic pore plate with a vertically and/or horizontally widened pore gap, wherein the ratio of the width of the widened pore gap to the width of the pore gap which is not widened is more than or equal to 1.8;

when the ratio of the width of the widened hole gap to the width of the hole gap which is not widened is less than 1.8, the integral rigidity of the geogrid is not obviously improved, and the connection strength between the single nets of the geogrid through the reinforcing ribs is not improved much.

(3) Respectively carrying out biaxial stretching on the plastic pore plate with the widened pore gap in the vertical direction and the horizontal direction; the stretching temperature is controlled to be 80-380 ℃; or when the body of the biaxial stretching bidirectional plastic geogrid is in a thermal deformation state through heat absorption, applying external force to the geogrid to realize triaxial stretching, wherein the direction of the external force forms an acute angle with the included angle of the transverse stretching plane.

To realize the twisted shape of the rib, external force must be applied to the bidirectional plastic geogrid in a thermal deformation state, and the direction of the external force forms an acute angle with the included angle of the transverse stretching plane. Preferably, in a product shaping area after biaxial stretching is finished, the triaxial stretching of the plastic geogrid is realized; the twisting of the ribs and/or the oblique ribs of the bidirectional plastic geogrid is realized by controlling the wind speed and changing the direction of the wind power, and the twisting degree of the ribs and/or the oblique ribs can be controlled by controlling the wind speed.

(4) The method for manufacturing the concave and convex points on the upper and lower bottom surfaces of the reinforcing rib which is vertically long in the whole width can be preferably characterized in that a die with certain patterns is arranged on a transverse tenter, and the concave points and/or the convex points on the upper bottom surface and/or the lower bottom surface of the vertical reinforcing rib are simultaneously manufactured when the grating is transversely stretched.

Preferably, a mold with a certain pattern is arranged on the transverse tenter, so that the automatic production of the vertical reinforcing rib concave points and/or convex points on the width edge of the bidirectional plastic geogrid can be realized, and different patterns can be changed according to the needs of engineering.

Preferably, another preferable method for manufacturing the full-width long reinforcing ribs and the concave and convex points on the upper and lower bottom surfaces of the nodes is that the bi-directional plastic geogrid subjected to biaxial stretching or triaxial stretching is subjected to specific die pressing rollers or laser printers in a thermal deformation state to manufacture the full-width long reinforcing ribs and the concave and convex points on the upper and lower bottom surfaces of the nodes.

The biaxial stretching or triaxial stretching bidirectional plastic geogrid is used for manufacturing concave points and convex points on the upper bottom surface and/or the lower bottom surface of the whole-width long reinforcing rib of the bidirectional plastic geogrid through a specific mold press roll in a thermal deformation state, the specific mold press roll can be used for manufacturing the concave points and/or the convex points on the upper bottom surface and/or the lower bottom surface of the whole-width long reinforcing rib vertically and transversely in the middle of the bidirectional plastic geogrid, or a set of laser printing process is added on line, so that the concave points and/or the convex points forming characters and/or patterns on the reinforcing rib, the rib and the node are manufactured on line, the product is marked, and the product quality is traced.

The invention has the beneficial effects that:

the connecting parts of the vertical ribs and the whole long reinforcing ribs are sunken and are in a sunken curved surface shape, and through the transition of the curved surface shape, the tensile strength of the geogrid can be enhanced, and the reinforcing capability of the bidirectional plastic geogrid to engineering projects is ensured.

The whole-width long reinforcing ribs are arranged, on one hand, the whole rigidity of the bidirectional plastic geogrid can be improved, the bearing capacity of the bidirectional plastic geogrid is increased, on the other hand, the whole-width long reinforcing ribs have enough rigidity and strength, the connection efficiency of the whole-width long reinforcing ribs of the bidirectional plastic geogrid can be improved through connection, and meanwhile, the connection strength between single geogrid nets can also be improved.

And thirdly, due to the arrangement of the oblique ribs of the bidirectional plastic geogrid, the stress distribution of the bidirectional plastic geogrid in the circumferential direction is approximately uniform.

And the ribs and/or the oblique ribs are arranged in a twisted shape, so that the shearing resistance of the ribs and/or the oblique ribs can be improved, and meanwhile, the friction force between the ribs and/or the oblique ribs and the soil body can be further increased.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention.

Shown in the figure:

1. rib 2, node 3, strengthening rib.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A bi-directional plastic geogrid and a manufacturing method thereof, as shown in figure 1. The bidirectional plastic geogrid is a planar reticular structure formed by connecting a plurality of ribs, a plurality of nodes and reinforcing ribs with the whole width in a staggered manner, and the plastic material of the bidirectional plastic geogrid is not limited, for example, the plastic material is one of PP, HDPE, PET, PA and the like or the combination of the materials; the mesh shape of the bidirectional plastic geogrid is not limited, and the projection graph of the mesh cavity holes of the bidirectional plastic geogrid is a rounded corner trilateral, a rounded corner quadrilateral, a rounded corner pentagon, a rounded corner hexagon, a rounded corner octagon, a trilateral, a quadrilateral, a pentagon, a hexagon, an octagon, a curve polygon, a runway shape or an ellipse and the combination of the shapes.